Electrical attachment-plug.



J. G. PETERSON.

ELECTRICAL ATTACHMENT PLUG.

APPLICATION FILED NOVA 23.1917.

Patented Dec. 24. 1918.

,/f \M\\\\\v \\\\\\\\\\\\`L f A rra ass :rarer Etc.

JOHANN 'G'. PETERSON, or' JERSEY CITY, NEW JERSEY. e

ELECTRICAL ATTACHMENT-PLUG.

T 0 all whom t may concern 'Bel it known tliat`lJtii`iiiNN lF/riznsoN, a citizen of the United States. residing at Jersey (ity, in the county of Hudson and State y,of New Jersey. have invented certain new and'useful Improvements in Electrical Attaclinient-llugs of which the following is a specification.

This invention relates to electrical attachment plugs,J the object of the invention being to provide an appliance of this kind which can be easily connected to an incandescent Ianip socket or its equivalent, for instance a socket of the Edison type. and whiclifli'as at the 'same time means yfor the association of an extension connection there- With, they construction being simple, effective', compact. and inexpensive to produce.

In the drawings accompanying and forming part-ofthe present. specification l show in llet'zlil one convenient form of embodime tfof the invention, which to enable those skilleld'inthe art to practise the saine will be set' forth "in detail in the following description. l do not necessarily restrict inyself to this exact disclosure; l may depart therefrom in several respects within the .scope cl'f the invention defined by the claim follo\\'ing saidy description. l

Referring to said drawings: Figure 'l is a bottoni plan view of an electricayl attachment plug involving the invention. I

Figflisa lloi'igitudinal central vertical section ot'itlie plug.l

Fig. 3 is a bottom plan view of the same. Fig. 4 is'a 'transverse section ou the imc i 4 4 of Figx. loilikingin the direction if the arrows.1

Figs. 5 and (3 are detail views in perspective of connectors. y

Like characters refer to like parts throughout the several viewswhich are on ditl'erent scales.

'lhe appurtcnanee comprises in its inake up a suitable body which is generally of circular lorm in cross section. ln `fact the body may be in the main cylindrical and may taper toward one end. A body such as that denoted in a general way by 2 answers my requirements in a satisfactory manner. This body may'be made of porcelain or some composition of insulating material. lts reduced end has fitted around it the contact shell 3 usually made from sheet brass and preferably threaded to f itan Edi- Specication of Letters Patent.

Application led November 23, 1917. Serial No. 203,619.

lille reduced end of the insulating centrally therefrom and through the slot 5 in the flange t3 of the contact shell 3, this flange .overlying and fitting tlatwi'se against the reduced end of the body or core 2.

The larger end of said body or core has a socket T to receive thc contact shell 8, said Contact shell 8 having upon its bottom the inwardly extending flanges 9 and 10 which t against the bottoni of said socket. This shell' 8 constituting a suitable contact. is preferably internally threaded to receive the plug or shell portion of a lamp or the like. The shell 3. as'will loe understood, is adapted to tit within a cooperating shell ot a socket. 'lhe flanges t) and l() of the contact shell 8 are perforated to receive the screws l1 and l2. the shanks of which proliect through openings l?) and ll. extending from the socket 7 to the reducedend of the insulating body oi' core 2. The threaded portions' of these screws tit threaded open- .ings in a washer as 15 fitted against the flange t3 of the exterior shell 3, the heads of the screws acting against the flanges 9 and l() respectively of the interior shell 8 to hold the parts assembled.

ln addition to the two Ilateral openings or i holes l and 14, the body or core 2 has a central holel 1T extending from the Chamber 7 to and through the projection' or key l. Projecting entirely through the' hole or opening 1T is the screw 18 to which is connected the disk or nut 19 constituting a central end contact, the vhead of the screwil constituting a companion end contact, although the head 1H has means as l will hereinafter explain which cooperates therewith to present the ,central end Contact at the place ncuestion.

lt will be supposed that the plug end of the article or that equipped with the shell 3, is fitted into an incandescent'socket in such manner as to bring' thc shell Sinto electrical suitable appliance can, of course, be inserted in the shell 8. The screws ll and 12 inthe tio .then forward as at illustration given will, of course, function.l

in the conduct of current, although the screw 1l is primarily intended for this purpose. Nevertheless the screw l2 does act in the particular capacity mentioned, although the screw l2 or equivalent means is prin'larily provided to hold the parts in assembled relation.

Extending centrally from the bottom of the socket 7 and in onel piece with the body 2, is the projection 20 which is approximately rectangular in forni and against which the head of the central screw 18 already described bears, although in the present case not directly. Coperative with the central screw 18 and the lateral or side screw 'll are connectors such as those denoted in a general way by 2l and 22 and shown in detail respectively by Figs. 6 and 5. The body of the connector'2lvis denoted by 23 and is in the form practically of a disk having a central perforation to receive the screw 18 which is countersunk in the perforation, so that the head of the screw and the disk portion are practically flush for engage- `nient as already noted, by the central end Contact of the plug portion of a lamp introduced into the shell 8. This body 23 is provided with the laterally extending portion 23 which is bent downward as at 25 and 26, beyond which it is continued as at 27 to form a resilient or spring Contact, the body 2 having the channel 28 to receive practically the entire projecting portion of the connector 2l.

The body 2 externally thereof and practically centrally of'its length, is furnished with the boss or hub 29 having through it the opening 30 in register with the channel or groove 28 and receiving the contact finger This contact 27 is adapted to directly coact with a complemental contact as will hereinafter appear.

The flange 9 of the shell 8 has upon it the body 3l of the connector 22, said body fitting around the projection 20 which I have already described, and being perforated to receive the screw 1l, the head of the screw holding the body 3l against and in electrical engagement with the fiange 9. This body 3l is provided with the downwardly-extending portion 32 having the outwardly-extending portion 33 presenti-ng a contactcomplemental to and'in parallelism with thecontact 27. The body 2 has a channel 34 to receive the projecting portion 32 and contact which l in coincidence with the channel or groove 34.

The cap portion 36 is provided with the contacts 37 and 38 to which the Wires 39 areconnected, the butt portions of the two contacts extending be introduced into the openings30 and 35 to engage the spring contacts 27 and 33. When it is desired to disconnect electrically the cap 3G from the plug `cap is in place, however, the inner flat face of its insulating body its practically flatwise against the outer face of the hub or boss 29.

What I claim is:

An electrical attachment plug comprising an insulating body, a contact shell fitted over one end of the body, the other end of the body having a socket, a contact shell fitted in said socket, al screw disposed centrally of the body and extending from the bottom of said socket to the other end of the body, the ends of said screw having central end contacts, two other screws at opposite sides of said central screw, extending from cbntact extends into the hole 35 from the cap 36 so as to I propeait will i pulled to the right 'inF ig. 2. When the one shell to thc other, a one-piece electrical i 'connector through the'body of which said the insulating body into which said conininals for a tap connection,

In testimony whereofl affix my signature in the presence of two witnesses.

J/OHANN. G. PETERSON. i Nitnessesz f 1 L. L. MARKEL, HEATH SUTHiERLAND.

y ggbody. ning intokwhlch tlie s, the two extended 

